Internal combustion engine



FIG. 1 is a perspective view of an internal combustion engine showing mydesign;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a side view thereof; and,

FIG. 7 is an opposite side view thereof.

The ornamental design for an internal combustion engine, as shown anddescribed.